Why Isn't My Plant Growing?

Why Isn’t My Plant Growing?

Have you ever had a plant that looks perfectly healthy, but you can’t remember the last time it gave you a new leaf? The foliage looks good, there’s nothing that really stands out as being wrong, and yet it seems like that plant has been sitting there doing absolutely nothing for months.

I hear this quite a bit, and one of the first things I’m interested in is how much light that plant is receiving. Because when we talk about growing houseplants, there’s a difference between a plant having enough energy to maintain the leaves it already has and having enough energy to support new growth.

And that’s something I think is really important to understand, especially when you’re hoping to grow those beautiful, mature plants with larger leaves and fuller growth.

There’s a Difference Between Maintaining a Plant and Growing One

Plants use light to produce energy-rich sugars through photosynthesis. Those sugars support everything from maintaining existing leaves and stems to developing new roots, producing foliage, and building stronger growth.

A plant can continue looking green and healthy while growing very slowly. It may have enough resources to maintain much of what it already has, while the development you’re hoping to see is happening at a much slower pace.

This is especially interesting when you start comparing plants that have been growing in different locations. You might have a Philodendron near a bright window that’s producing beautiful new leaves, while another plant of the same type, growing farther back in the room, is barely changing.

They’re both growing in your home, but the amount of light reaching those leaves can be very different.

I like to look at how the plant has been developing over time. Are the new leaves getting larger? Are they coming in around the same size as the previous ones? Is the plant producing longer stems with more space between the leaves?

Those changes can tell us quite a bit about how the growing environment is influencing its development.

Let’s Look at Where Your Plant Is Growing

One of the biggest things I see with indoor plants is how much light changes as you move farther away from a window.

You can walk into a room that looks beautifully bright, and yet a plant sitting four or five feet away from the window may be receiving considerably less usable light than a plant sitting right beside it.

Our eyes adjust to the brightness in a room, which is one of the reasons I love teaching people how to measure light at the leaves.

Think about where your plant is sitting. Which direction does the window face? How far away is the plant? Are there trees, curtains, or buildings affecting the light coming through?

If I have a tropical foliage plant that’s growing slowly, I’m going to start looking at those things. Sometimes moving a plant a little closer to an appropriate window can make a noticeable difference in how it develops.

For many of our houseplants, getting them within one to three feet of a suitable window is a good starting place, depending on the species and the amount of light coming through that window.

And as you make changes, watch what happens with the new growth. The leaves that develop under those conditions can help you understand how well the new location is working.

Your Plant’s Growth Can Tell You About Its Light

One of the things I find interesting is how plants change their growth habits in response to the light available to them.

You may notice longer spaces between leaves as a plant grows toward a light source. Some plants begin producing smaller foliage, while others slow down their development considerably.

If you’re growing a climbing plant, pay attention to how the newest section of the vine compares with the older growth. Are the leaves continuing to size up? Is the stem extending while the foliage stays small? Is the plant reaching toward the window?

Those are observations you can use when evaluating your light.

And remember that the type of plant matters here, too. A Monstera, Hoya, Philodendron, and Anthurium can all have different growth habits and different rates of development. Their maturity and the support available to climbing species can influence leaf size as well.

This is why I encourage people to become familiar with the plants they’re growing. You’ll begin recognizing what normal development looks like for that particular plant and when its growth starts changing.

What About Grow Lights?

At Rooted Plant Shop, I grow entirely under plant lights. I have three north-facing windows, and the natural light coming through those windows isn’t enough to support all the different plants I’m growing. My plant lights allow me to create the growing conditions those plants need, regardless of the windows available in the building.

At home, I use a combination of natural window light and supplemental lighting. And I think having those two different growing environments has given me a really good opportunity to observe how plants respond to the light they’re receiving.

For many tropical foliage plants, I generally recommend full-spectrum lighting in the 5,000K–6,500K range, with approximately twelve to fourteen hours of light each day. The actual intensity reaching the plant is just as important as how long the lights are running.

One of the things I pay close attention to is where the light is positioned in relation to the plant. I want that light reaching the canopy, where the leaves can use it. The farther away a light is positioned, the less intensity generally reaches the foliage. And depending on the fixture, bringing it closer can make a substantial difference.

This is where I like using a light meter. Measuring foot-candles at the leaves gives you a much better understanding of what your plant is receiving. You can make small adjustments to the distance and watch how the readings change.

As you bring a fixture closer, keep in mind that stronger light can also cause damage when the intensity becomes too high for the plant. I like making gradual adjustments so the leaves have an opportunity to acclimate.

And what’s really interesting is watching how the plant responds over the following weeks. You may notice changes in leaf size, how frequently new leaves develop, or even how quickly the growing medium begins drying between waterings.

Those observations can help you understand how well your lighting is supporting the plant’s growth.

What’s Happening With the Roots?

While we’re watching for new leaves, there’s also quite a bit of development happening underneath the growing medium.

Sometimes a plant is establishing new roots after being brought home or repotted. It may be putting resources into root development before you notice much happening above the soil.

Roots are responsible for taking up the water and mineral nutrients that support the rest of the plant. Their health influences how well a plant can maintain itself and produce new growth.

This is why I like paying attention to how a plant is using water alongside how it’s growing.

Let’s say you’ve got a plant that’s been sitting in the same spot for several months. It hasn’t produced much new growth, and you’re noticing that the growing medium is taking a long time to dry.

That gives me a reason to evaluate how much light the plant is receiving. If we improve the lighting and the plant begins moving through its moisture a little faster, that’s useful information about how its environment is changing.

I would also consider the growing medium and the size of the pot. A healthy root system needs access to both water and oxygen, and an appropriately sized container helps us manage those conditions.

When the plant’s growth and watering patterns give us reason to look more closely, we can gently examine the root ball while preserving the healthy roots that are already established.

Temperature, Seasons, and Nutrition Play a Part Too

Something else to remember is that our homes change throughout the year.

As the days get shorter, the amount of natural light coming through the windows changes. Temperatures may be cooler, and the plants may begin growing more slowly.

You can have a plant that’s been growing beautifully all summer and then notice that its development slows considerably as we move into fall and winter.

That’s a great opportunity to evaluate how much light is available and whether supplemental lighting could help maintain a more consistent growing environment.

Nutrition also supports healthy growth. Plants need mineral nutrients to develop new tissue, and I use fertilizer as part of my regular growing practices at Rooted. But the amount of active growth, light available, and condition of the roots all influence how a plant can use those nutrients.

If I’m looking at a plant that’s barely growing, I want to understand its environment so I can support the conditions that encourage healthy development.

And sometimes the plant is simply growing at its own natural pace. Different species have different growth rates, and a mature plant may develop differently from a young one.

Start Watching the New Growth

If you’ve got a plant that’s been growing slowly, take a picture of it today. Look at the newest leaf, the length of the stem, and where it’s sitting in relation to your light.

You can measure the light at the leaves if you have a light meter, or begin by evaluating the window direction and distance. If the plant would benefit from a little more light, make an appropriate adjustment and give it some time to respond.

Over the following weeks, pay attention to how the new growth develops. You may notice a new leaf beginning to emerge, better leaf size, or a change in how quickly the plant uses water.

Some plants will respond faster than others, and developing new tissue takes time. I like having those earlier pictures because sometimes the changes are gradual enough that you don’t realize how much your plant has grown until you look back.

As you get familiar with those observations, you’ll start recognizing the relationship between the environment you’re providing and the growth you’re seeing.

And that’s one of the things I want people to enjoy about growing plants. There’s always something new to learn just by watching how they respond.

Keep Learning With Rooted

Light has such a tremendous influence on how our plants develop. From leaf size and growth habits to watering and root health, understanding the light available in your home can help you make more informed decisions about your entire collection.

That’s why I wrote The Rooted Guide to Lighting.

In the guide, we go much deeper into understanding natural light, window direction, foot-candles, grow lights, placement, and how light changes throughout the year. I also walk through how to evaluate your own growing spaces and make adjustments based on what your plants are showing you.

If you’ve been wondering why your plants are growing slowly, producing smaller leaves, or developing differently than you’d expected, this guide can help you understand how lighting influences those changes and how to build a growing environment that supports the results you’re looking for.

Explore The Rooted Guide to Lighting